Harrow



(NO Model.) F. GVMERRILL.

HARROW.

No. 471,719. Patented MaInZQ, 1892.

Pml

- ITI/vento?" acm.

BY xlZ-@TTOBNEY UNITE STATES ATENT EFICE.

FREEMAN C. MERRILL, OE SOUTH PARIS, MAINE.

HARROW.

SPECIFICATION forming part of Letters Patent No. 471,719, dated March29, 1892.

Application filed nach 24, 1890.

`To all whom it may concern:

Ie it known that I, FREEMAN C. MERRILL, a citizen of the United States,residing at South Paris, in the county of Oxford'and State of Maine,have invented certain new and useful Improvements in Harrows; and I dohereby declare that the following is a full, clear, and exactdescription of the invention, which will enable others skilled in theart to which it appertains to make and use the same.

My invention relates to an improvement in harrows, and particularly toharrows having spring-teeth.

My invention consists in improved means for fastening the teeth, inorder that they may be adj Listed so as to give their points more orless depression. This is effected by securing the curved tooth upon thesurface of the frame and securing it thereon by a clip which engages itin a single transverse line and permits the tooth to be moved when thebolts or other means by which the clip is secured are loosened.

In the drawings, Figure l is a top plan ofa portion of the frameprovided with a tooth and clip. Fig. 2 is a Vertical section of the samethrough the line y y of Fig. l. Fig. 3 is aside elevation ot' the frameand clip. Fig. 4 is a bottom plan of the clip. Fig. 5 is a verticalsection through the line y Ay of Fig. l.

The tooth ct is the ordinary curved or bow tooth having a curvaturethroughout its length.

B is the clip, of the general shape shown in the. drawings. It isprovided with bolt-holes Z Z, between which, on the under side, themetal is hollowed out from the front or toe of the clip to the rear orheel, (see Fig. 5,) leaving, however, slightly in the rear of thebolt-holes Z l a ridge or bar e of metal, as seen in Figs. 2, 4, and 5.The distance between the bottom of the ridge e and the bottom of theclip should be somewhat less than the thickness ofthe tooth to be used.At the front or toe ofthe clip, upon the under side, may be placed theprojections o o, (see Fig. 4,) if desired.

b is the frame of the harrow, the upper surface being preferably flat.In securing the tooth te the harrow, the end of the tooth is laid uponthe surface of the frame and the clip laid upon it, as seen in Fig. l.The bolts Serial No. 345,048. (No model.)

o c are passed up through the frame and held by the nuts CZ d, whichupon being set down depress the toe of the clip upon the frame and forcethe ridge e firmly down upon the tooth. The tooth is thus rigidly heldby means of the ridge e, which is in contact with the tooth in a singletransverse line and directly above the bearing of the tooth on theframe, the tooth thus being permitted the greatest amount of playconsistent with its being heldin the same position.

Adj ustment is made in the obvious manner ot' loosening l the bolts andsliding the ltooth the required distance. It the tooth works loose, thenuts may be set down.

Strain upon the tooth when in use tends to raise the h'eel and force thetoe firmly upon the frame, the bolts c c, as stated, being between thetoe of the clip and the ridge e, and any desired pressure on the toothmay be obtained by tightening the nuts d d. Under no conditions of use,however, does the clip engage the tooth at any point, except in onetransverse line, the clip being hollowed out on the under surface beforeand behind the ridge sufficiently forthis purpose.

By forming the clip with a concavity on its under side an opening orspace is formed, in which is located the binding ridge or rib. The shankof the tooth is passed under and between this ridge or rib and theframe, while the toe of the clip passes by and beyond the curve of thetooth upon either side and rests upon the frame. The bolts pass throughthe clip and frame upon each side of the tooth and between the contactof the ridge or rib with the tooth and bearing of the toes of the clipupon the frame firmly set up, and thus the clip holds the tooth rigidlyupon the frame while at work.

What I claim as my invention isp 1. The combination of the tooth a,frame b, and clip B, the latter being hollowed out on the under side andhaving the ridge e, boltholes Z l, and bolts c c, each passing throughthe clip between the contact of the clip with the tooth and with theframe, substantially as described, for the purposes set forth.

2. The co mbination of the curved tooth with the frame, the clip havingthe ridge e, and

'the bolts passing through the clip and the frame upon each side of thetooth and between ICO - the Contact of the ridge with the tooth and theContact of the toes of the clip upon the frame, substantially as setforth.

3. In combination withaharrow frame and tooth, a oiip having atransverse ridge on its under side, and means for fastening the clip inpiace, said clip adapted to rest only at its toes on the frame and tohold the tooth in po-k sition between the clip and the frame by pressureof the ridge through its fastening Io means upon the tooth. i y

In testimony that I claim the foregoing as my invention I have hereuntoset my hand this 17th day of March, A. D. 1890.

FREEMAN C. MERRILL. In presence 0f- CHAs. A. HERSEY, C. L. HERsEY.

